Middle Jurassic Topawa group, Baboquivari Mountains, south-central Arizona: Volcanic and sedimentary record of deep basins within the Jurassic magmatic arc
G. B. Haxel, J.E. Wright, N. R. Riggs, R. M. Tosdal, D. J. May
2005, Special Paper of the Geological Society of America 329-357
Among supracrustal sequences of the Jurassic magmatic arc of the southwestern Cordillera, the Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona, is remarkable for its lithologic diversity and substantial stratigraphic thickness, ???8 km. The Topawa Group comprises four units (in order of decreasing age): (1) Ali Molina Formation-largely pyroclastic rhyolite...
Hydrogeomorphic classification for Great Lakes coastal wetlands
Dennis A. Albert, Douglas A. Wilcox, Joel W. Ingram, Todd A. Thompson
2005, Journal of Great Lakes Research (31) 129-146
A hydrogeomorphic classification scheme for Great Lakes coastal wetlands is presented. The classification is hierarchical and first divides the wetlands into three broad hydrogeomorphic systems, lacustrine, riverine, and barrier-protected, each with unique hydrologic flow characteristics and residence time. These systems are further subdivided into finer geomorphic types based on physical...
Discoloration of polyvinyl chloride (PVC) tape as a proxy for water-table depth in peatlands: validation and assessment of seasonal variability
Robert K. Booth, Sara C. Hotchkiss, Douglas A. Wilcox
2005, Functional Ecology (19) 1040-1047
Summary: 1. Discoloration of polyvinyl chloride (PVC) tape has been used in peatland ecological and hydrological studies as an inexpensive way to monitor changes in water-table depth and reducing conditions. 2. We investigated the relationship between depth of PVC tape discoloration and measured water-table depth at monthly time steps during...
Recent research on the Chesapeake Bay impact structure, USA - Impact debris and reworked ejecta
J. Wright Horton Jr., John N. Aleinikoff, Michael J. Kunk, Gregory S. Gohn, Lucy E. Edwards, Jean M. Self-Trail, David S. Powars, Glen A. Izett
2005, Book chapter
Four new coreholes in the western annular trough of the buried, late Eocene Chesapeake Bay impact structure provide samples of shocked minerals, cataclastic rocks, possible impact melt, mixed sediments, and damaged microfossils. Parautochthonous Cretaceous sediments show an upward increase in collapse, sand fluidization, and mixed sediment injections. These impact-modified sediments...
Occurrence of Cyathocephalus truncatus (Cestoda) in fishes of the Great Lakes with emphasis on its occurrence in round gobies (Neogobius melanostomus) from Lake Huron
John R. P. French III, Patrick M. Muzzall, Jean V. Adams, Kendra L. Johnson, Angela E. Flores, Andrea M. Winkel
2005, Journal of Great Lakes Research (31) 405-413
Cyathocephalus truncatus is a pathogenic cestode that is common in many Laurentian Great Lakes fish species, but the depth distribution of this cestode has not been studied. Cyathocephalus truncatus has been reported from 21 fish species and one hybrid representing seven orders and nine families in Lakes Superior, Michigan, Huron, and Ontario. We...
Nonlinear dynamics in ecosystem response to climatic change: Case studies and policy implications
Virginia R. Burkett, Douglas A. Wilcox, Robert Stottlemyer, Wylie Barrow, Dan Fagre, Jill Baron, Jeff Price, Jennifer L. Nielsen, Craig D. Allen, David L. Peterson, Greg Ruggerone, Thomas Doyle
2005, Ecological Complexity (2) 357-394
Many biological, hydrological, and geological processes are interactively linked in ecosystems. These ecological phenomena normally vary within bounded ranges, but rapid, nonlinear changes to markedly different conditions can be triggered by even small differences if threshold values are exceeded. Intrinsic and extrinsic ecological thresholds can lead to effects that cascade...
Thiamine status of Cayuga Lake rainbow trout and its influence on spawning migration
H. George Ketola, Thomas L. Chiotti, Robert S. Rathman, John D. Fitzsimons, Dale C. Honeyfield, Peter J. Van Dusen, Graham E. Lewis
2005, North American Journal of Fisheries Management (25) 1281-1287
Rainbow trout Oncorhynchus mykiss in Cayuga Lake, New York, appear to be suffering from a thiamine deficiency because their progeny develop general weakness, loss of equilibrium, and increased mortality, which are prevented by treatment with thiamine. Thiamine status and its effect on adults are unknown. In 2000 and 2002, we...
Application of neural networks to prediction of fish diversity and salmonid production in the Lake Ontario basin
James E. McKenna Jr.
2005, Transactions of the American Fisheries Society (134) 28-43
Diversity and fish productivity are important measures of the health and status of aquatic systems. Being able to predict the values of these indices as a function of environmental variables would be valuable to management. Diversity and productivity have been related to environmental conditions by multiple linear regression and discriminant...
A comparison of seismic event detection with IASPEI and earthworm acquisition systems at Alaskan volcanoes
James P. Dixon, John A. Power, Scott D. Stihler
2005, Seismological Research Letters (76) 168-176
Since 1988, Alaska Volcano Observatory (AVO) has been continually monitoring seismicity at active volcanoes in Alaska (Dixon et al., 2004). The AVO seismic network has grown from 27 stations on the Cook Inlet volcanoes (Augustine, Iliamna, Redoubt, and Spurr) to 160 stations on 27 volcanoes in...
Composition and trace element content of coal in Taiwan
L.-Y. Tsai, C.-F. Chen, Robert B. Finkelman
2005, Terrestrial, Atmospheric and Oceanic Sciences (16) 641-651
To investigate the trace element contents of local coal, four coal samples were collected from operating mines in NW Taiwan. Detailed petrographic and chemical characterization analyses were then conducted. Analytical results indicate that (1) the samples were high volatile bituminous coal in rank with ash content ranging from 4.2 to...
Influence of water temperature on acetylcholinesterase activity in the pacific tree frog (Hyla regilla)
Catherine S. Johnson, Steven E. Schwarzbach, John D. Henderson, Barry W. Wilson, Ronald S. Tjeerdema
2005, Environmental Toxicology and Chemistry (24) 2074-2077
This investigation evaluated whether acetylcholinesterase (AChE) in Pacific tree frogs (Hyla regilla) from different geographical locations was influenced by different temperatures during early aquatic life stages, independent of pesticide exposure. Tadpoles were collected from both a California coastal pond and a Sierra Nevada mountain range pond, USA. Groups of frogs...
Forest turnover rates follow global and regional patterns of productivity
Nathan L. Stephenson, Phillip J. van Mantgem
2005, Ecology Letters (8) 524-531
Using a global database, we found that forest turnover rates (the average of tree mortality and recruitment rates) parallel broad-scale patterns of net primary productivity. First, forest turnover was higher in tropical than in temperate forests. Second, as recently demonstrated by others, Amazonian forest turnover was higher on fertile than...
Chaparral fuel modification: what do we know --- and need to know?
Jon E. Keeley
2005, Fire Management Today (65) 11-12
Fire and the Miocene expansion of C4 grasslands
Jon E. Keeley, Philip W. Rundel
2005, Ecology Letters (8) 683-690
C4 photosynthesis had a mid-Tertiary origin that was tied to declining atmospheric CO2, but C4-dominated grasslands did not appear until late Tertiary. According to the ‘CO2-threshold’ model, these C4 grasslands owe their origin to a further late Miocene decline in CO2 that gave C4 grasses a photosynthetic advantage. This model is most appropriate for...
High priority needs for range-wide monitoring of North American landbirds
Erica H. Dunn, B.L. Altman, J. Bart, C.J. Beardmore, H. Berlanga, P.J. Blancher, G.S. Butcher, D.W. Demarest, R. Dettmers, W.C. Hunter, Eduardo E. Inigo-Elias, A.O. Panjabi, D.N. Pashley, C.J. Ralph, T.D. Rich, K.V. Rosenberg, C.M. Rustay, J. M. Ruth, T.C. Will
2005, Partners in Flight Technical Series 2
This document is an extension of work done for the Partners in Flight North American Landbird Conservation Plan (Rich et al. 2004). The Continental Plan reviewed conservation status of the 448 native landbird species that regularly breed in the United States and Canada. Two groups of species were...
Black Carp: Biological synopsis and risk assessment of an introduced fish
L.G. Nico, J.D. Williams, H.L. Jelks
2005, Special Publication 32
This book is a detailed risk assessment and biological synopsis of the black carp, a large mollusk-eating cyprinid fish native to eastern Asia. A great deal of controversy surrounds the presence of this foreign fish in the United States. Most of those associated with the aquaculture industry view black carp...
Factors influencing within-watershed genetic variation of coastal cutthroat trout
J. E. B. Wofford, R. E. Gresswell, M. A. Banks
2005, Ecological Applications (15) 628-637
No abstract available....
The influence of forest management on headwater stream amphibians at multiple spatial scales
M. Stoddard, J. P. Hayes
2005, Ecological Applications (15) 811-823
Understanding how habitat structure at multiple spatial scales influences vertebrates can facilitate development of effective conservation strategies, but until recently most studies have focused on habitat relationships only at fine or intermediate scales. In particular, patterns of amphibian occurrence across broad spatial scales are not well studied, despite recent concerns...
Distribution of pelagic forage fishes in relation to the oceanography of Glacier Bay
Mayumi L. Arimitsu, John F. Piatt, Marc D. Romano, David C. Douglas
2005, Book chapter, Proceedings of the Fourth Glacier Bay Science Symposium. U.S. Geological Survey Scientific Investigations Report 2007-5047, 246 p, 2004
Describing spatial pattern in stream networks: A practical approach
L.M. Ganio, C.E. Torgersen, R. E. Gresswell
2005, Frontiers in Ecology and the Environment (3) 138-144
The shape and configuration of branched networks influence ecological patterns and processes. Recent investigations of network influences in riverine ecology stress the need to quantify spatial structure not only in a two-dimensional plane, but also in networks. An initial step in understanding data from stream networks is discerning non-random patterns...
Allocating harvests among polar bear stocks in the Beaufort Sea
Steven C. Amstrup, George M. Durner, I. Stirling, T. L. McDonald
2005, Arctic (58) 247-259
Recognition that polar bears are shared by hunters in Canada and Alaska prompted development of the “Polar Bear Management Agreement for the Southern Beaufort Sea.” Under this Agreement, the harvest of polar bears from the southern Beaufort Sea (SBS) is shared between Inupiat hunters of Alaska and Inuvialuit hunters of...
Alunite in the Pascua-Lama high-sulfidation deposit: Constraints on alteration and ore deposition using stable isotope geochemistry
C. L. Deyell, R. Leonardson, R. O. Rye, J. F. H. Thompson, T. Bissig, D. R. Cooke
2005, Economic Geology (100) 131-148
The Pascua-Lama high-sulfidation system, located in the El Indio-Pascua belt of Chile and Argentina, contains over 16 million ounces (Moz) Au and 585 Moz Ag. The deposit is hosted primarily in granite rocks of Triassic age with mineralization occurring in several discrete Miocene-age phreatomagmatic breccias and related fracture networks. The...
Planning for bird conservation: a tale of two models
Douglas H. Johnson, Maiken Winter
2005, General Technical Report GTR-PSW-191
Planning for bird conservation has become increasingly reliant on remote sensing, geographical information systems, and, especially, models used to predict the occurrence of bird species as well as their density and demographics. We address the role of such tools by contrasting two models used in bird conservation. One, the Mallard...
Alkali elemental and potassium isotopic compositions of Semarkona chondrules
C. M. O’D. Alexander, Jeffrey N. Grossman
2005, Meteoritics and Planetary Science (40) 541-556
We report measurements of K isotope ratios in 28 Semarkona chondrules with a wide range of petrologic types and bulk compositions as well as the compositions of CPX-mesostasis pairs in 17 type I Semarkona chondrules, including two chondrules with radial alkali zonation and 19 type II chondrules. Despite the wide...
Do wintering Harlequin Ducks forage nocturnally at high latitudes?
Daniel Rizzolo, Daniel Esler, Daniel D. Roby, Robert L. Jarvis
2005, Condor (107) 173-177
We monitored radio-tagged Harlequin Ducks (Histrionicus histrionicus) to determine whether nocturnal feeding was part of their foraging strategy during winter in south-central Alaska. Despite attributes of our study site (low ambient temperatures, harsh weather, short day length) and study species (small body size, high daytime foraging rates) that would be...
